well I must to confess enjoying buying new for my DS's as much as I can.......
HOWEVER they are also given plenty of hand-me-downs and I've picked a few bits up in charity shops for them too.
For me it's more that I ALWAYS lived in (badly made) homemade clothes and 2nd hand stuff when I was young and hated it as I often got teased, so I suppose in some ways I'm trying to "protect" my DS's from that. However, DS1's best "smart" top was a 60p job from the Red Cross shop - so I'm not too daft about it.
And ALL of my DS's used clothes (if still useable - as they tend to get handed down from child to child....) are passed onto other people.